<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <!--
    表格: table
    行: tr
    单元格: td

    三行两列的表格
  -->
  <table border="1" cellspacing="0" cellpadding="0">
    <tr>
      <td>1-1</td>
      <td>1-2</td>
    </tr>
    <tr>
      <td>2-1</td>
      <td>2-2</td>
    </tr>
    <tr>
      <td>3-1</td>
      <td>3-2</td>
    </tr>
  </table>

  <table border="1" cellspacing="0" cellpadding="0" align="center">
    <tr>

      <td colspan="2" align="center" style="height: 50px;" valign="bottom">1-1</td>
      <td>1-3</td>
      <td>1-4</td>
    </tr>
    <tr>
      <td>2-1</td>

      <td rowspan="2" colspan="2">2-3</td>
      <td>2-4</td>
    </tr>
    <tr>
      <td>3-1</td>

      <td>3-4</td>
    </tr>
    <tr>
      <td>4-1</td>
      <td>4-2</td>
      <td>4-3</td>
      <td>4-4</td>
    </tr>
  </table>
</body>
</html>